Test D

Steroid Terms

Testosterone DecanoateTest Deca

Definition

The longest-acting of the common single testosterone esters, with a half-life of roughly 7.5 days. Familiar as the sustained tail in Sustanon 250, and sold standalone by UGLs. Slow to reach steady state and slow to clear, so it is hard to titrate.

Related Blood Markers

Testosterone

Unit: nmol/L

Primary male sex hormone. Important for muscle growth, bone density, and mood.

Estradiol

Unit: pmol/L

Primary estrogen. Important for bone health, lipids, and cardiovascular protection.

SHBG

Unit: nmol/L

Protein that binds sex hormones, reducing their bioavailability.

Related Compounds

Testosterone Decanoate

AAS

Long-ester testosterone. The longest-acting of the common injectable esters. No standalone pharmaceutical product exists; best known as the 100 mg tail of Sustanon 250, but sold by UGLs as "Test D".